just put a small paper in side the jar with the writting facing out ,thats what i do
LOL... that'd be a real *stickynote* in any jar of bud I grew myself.
Seriously... with the drifts that pile up in the bottom of the jars, I always put it on the outside.
Sharpie markers write well on glass... and it rubs off pretty well if you scrub hard. That... or just use the paper/marker/tape combo on the outside.
Stay Safe!